Add QuicFlagSaver to files in net/tools/quic/

net/tools/quic/end_to_end_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 #include <sys/epoll.h>
 
 #include <list>
 #include <memory>
 #include <string>
@@ skipping 612 matching lines @@
               QuicFlowControllerPeer::ReceiveWindowSize(server));
     EXPECT_EQ(QuicFlowControllerPeer::ReceiveWindowSize(client),
               QuicFlowControllerPeer::SendWindowSize(server));
   }
 
   // Must be called before Initialize to have effect.
   void SetSpdyStreamFactory(QuicTestServer::StreamFactory* factory) {
     stream_factory_ = factory;
   }
 
+  QuicFlagSaver flags_;  // Save/restore all QUIC flag values.
   bool initialized_;
   IPEndPoint server_address_;
   string server_hostname_;
   std::unique_ptr<ServerThread> server_thread_;
   std::unique_ptr<QuicTestClient> client_;
   PacketDroppingTestWriter* client_writer_;
   PacketDroppingTestWriter* server_writer_;
   bool server_started_;
   QuicConfig client_config_;
   QuicConfig server_config_;
@@ skipping 2273 matching lines @@
   EXPECT_EQ(kBarResponseBody, client_->response_body());
   QuicConnectionStats client_stats =
       client_->client()->session()->connection()->GetStats();
   EXPECT_EQ(0u, client_stats.packets_lost);
   EXPECT_EQ(1, client_->client()->GetNumSentClientHellos());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net